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Annealing steps modeling for infrared photodiodes
KTH, School of Engineering Sciences (SCI), Applied Physics.
2019 (English)Independent thesis Advanced level (degree of Master (Two Years)), 20 credits / 30 HE creditsStudent thesis
Abstract [sv]

Många civila och militära tillämpningar bygger på detektion av ljus i det infraröda spektrumet: mörkerseendeglasögon, termografi eller satellitbilder. Dessa komplexa och specialiseradetillämpningar kräver en tillförlitlig och högpresterande teknik för fotodetektorer.En aktuelltrend är att öka genomströmning och detektor storlek. Ett särskilt steg i processen ären glödgning under mättar kvicksilver tryck av wafers. Den experimentella kunskapen omglödgning är otillräcklig, men det är också ett avgörande steg för processen.Syftet med denna uppsats var att undersöka numeriskt glödgning processen under mättarkvicksilver tryck och extrahera information som inte var tillgängliga med experimentellamätningar.Vi utvecklade stegvis en modell och raffinerade den tills den passade väl de experimentellamätningarna. Vi kunde sedan extrahera meningsfulla data: vi upptäckte att de experimentellamätningarna var vinklade, att den kalla punkten som reglerar kvicksilver trycket inte bibehöllspå rätt plats, och vi kom fram till ljuset att det fanns inhomogenitet mellan och längs substraten.Slutligen överfördes dessa resultat för att hjälpa att fastställa specifikationerna för nya ochstörre ugnar.

Abstract [en]

Numerous civil and military applications are based on the detection of light in the infraredspectrum : night-vision goggle, thermography or spatial imaging. These complex and specializedapplications require a reliable and high performing technology of photodetectors. Acurrent trend is to increase throughput and detector size. One particular step in the process,is an annealing under saturating mercury pressure of the wafers. The experimental knowledgeof the annealing is insufficient, but it is also a crucial step : during the process, the samplesneed to remain inside their stability domain at all time, so they do not deteriorate.The goal of this thesis was to investigate numerically the annealing process under saturatingmercury pressure and extract information that were not accessible with experimentalmeasurements.We incrementally developed a model and refined it until it fitted well the experimentalmeasurements. We were then able to extract meaningful data : we discovered that the experimentalmeasurements were biased, that the cold point regulating the mercury pressure wasnot maintained at the right spot, and we brought to light that there were inhomogeneitiesbetween and along the substrates. Even though we found out these problems, we checked thatthe samples remained inside the stability diagram during the whole process.Finally, these results were transmitted to help establish the specifications of new and largerfurnaces.

Place, publisher, year, edition, pages
2019.
Series
TRITA-SCI-GRU ; 2019:021
National Category
Physical Sciences
Identifiers
URN: urn:nbn:se:kth:diva-245032OAI: oai:DiVA.org:kth-245032DiVA, id: diva2:1293627
Available from: 2019-03-05 Created: 2019-03-05 Last updated: 2019-03-05Bibliographically approved

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